Extrusion



FIG. 1 is a front perspective view of a first embodiment of an attachment piece showing our new design;

FIG. 2 is another front perspective view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a front perspective of a second embodiment of the attachment piece;

FIG. 5 is a rear perspective view thereof;

FIG. 6 is a front perspective of a third embodiment of the attachment piece; and

FIG. 7 is a rear perspective view thereof. 

CLAIM The ornamental design for an extrusion, as shown and described. 